Process for the oxidation of manganese carbonate.



UNITED STATES PATENT EOFFICE.

MOBDUCH L. KAPLAN, OF BROOKLYN, NEW YORK.

Ho Drawing.

To all whom it may concern:

Be it known that I, MonDUoH L. KAPLAN, a citizen of the United States, and a resident of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Proccsscs for the Oxidation of Manganese Carbonate, of which the following is a specification.

The object of this invention is to provide novel processes, whereby manganese carbonate may be rapidly, economically and with great efficiency oxidized.

Manganese carbonate M1100 as itis well known, when exposed to the action of hot air absorbs oxygen and loses carbonic acid This reaction, as it is known, begins at 260 centigrade, but is at this low temperature very slow and therefore of no practical value; only at much higher tempera-- tures it becomes more rapid, but at very high temperatures the carbonate is not a stable compound, especially in presence of Mn(). and it decomposes according to the fol lowing equations:

The resulting products of the air oxidation therefore always contain considerable quantities of Mn() and the ratio M nO :MnO is the lower, the higher the temperature was kept during the treatment. For the above reasons and also for the reason that MnO above 300" C. loses O changing into a lower oxid, the oxidation of .lVlnCK) with hot air mustbe conducted carefully and slowly and even in the best case, it is a matter of hours. .1 have discovered a new process whereby MnUl), can be oxidized very rapidly. and it consists in subjecting the carbonate at temperatures not much above 300 (1. to, the action of'o'xids of nitrogen, such as the decomposition products of nitric acid 2i l NO QNO LO -H O.

The oxidation proceeds according to the equation:

i\in(1(').,- -N(), -:Mn0,+-No+co,,' and as NO combines with oxygen, 2HN(), are capable of oxidizin 3Mn(l( Instead of using pure vapors o ijnitrir and l have Specification of Letters Patent.

Application'flied April 30, 1917.

PROCESS FOR THE OXIDATION OF MANGANESE CAQEBONATE.

Patented Nov. 20, 1917.

Serial No. 165,483.

foundit more practical to mix the same with large quantities of air in which case a small quantity of nitric acid, on ail-c unt of regeneration of N0 from St) and oxygen oi the air, can be made to oxidize large quantities of carbonate. 1 have found also that instead of vapors of nitric acid, NU. liberated by heat or dilution from its solution in I-I SQ, such solution havin r been obtained by passing the gases from 1. 1e oxi dation chamber together with air through sulfuric acid, can be used with the same rcsalts as to rapidity of reaction and composition of product. Instead of starting the reaction with oxids of. nitrogen, it can be started with air alone anil the hot carbonate then transferred to a eiianibeii contaim ing oxids of nitrogen, which way of working has the advantage that the hcatin of the carbonate can be done in heat com neting metallic vessrls, from which the hot carbonate is removed on its transference to said chamber.- v

What I claim as my invention and desire to secure by LettersPatent, is:

1. The process hereinbefore described of oxidizing manganese carbonate, comprising highly heated; to the action of an oxid o the subjection cf the manganese carbonate;

" nitrogen containing more oxygen than NO.

oxidizing manganese carbonate, comprising the subjection oi the manganese carbonate highly heated, to the, action of vapors oi nitric acid admixed with air in larger proportion than said vapors.

5. The process horeinbel'orc described of oxidizing manganese carbonate, con'iprising the beating of the mangai'iese car-bored to a icnipcralurcof aliovi- 250i)" i-i-uligrade and sublet-ling llic .--an|o lo the acti n oi wnpors of nitric acid admixed with air inlarger propel-lion lbah said. vapors.

(i. be process hcrclnbefore described of lid 5 'enee of nxidizing manganese carbonate comprising thesubjeetionof the same, highly heated, to..tl1e action of an oxid of nitrogen containing xygen not less than NO in presalr.

7. The process hereinbefore' described eomprisin the partial oxidation of manganese vcaiwnate by hot air and subjecting the same for further oxidation to the ac- 10 tion of a mixture of air with an oxid of.

nitrogen containing oxygen not less than Signed at New Yo'ik, in the county of New York, and State of New York, this 28th day of April, A. D. 1917.

MORDUCH L. KAPLAN.

Witnesses ARTHUR MARION,

CHAS. C. GILL. 

